Apple has launched the latest version of macOS, High Sierra, with an unpatched zero-day vulnerability in place, a worrying state of affairs even though the flaw is one which theoretically won’t affect the majority of users (at least those who take heed of Gatekeeper’s warnings).

The exploit was discovered by Patrick Wardle, chief security researcher at ‎Synack, and also affects earlier versions of macOS (and OS X for that matter).